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Nitric Acid, ASTM A, Practice C, (Huey Test) The specimens are boiled for five periods, each of 48 hours, in a 65 per cent solution of nitric acid. The corrosion. employed to measure the relative susceptibility of austenitic stainless steels to intergranular attack. ASTM A Practice C, boiling nitric acid test is also known . Ferric Sulfate – Sulfuric Acid, ASTM A – Practice B (Stretcher Test). Ferric Sulfate Nitric Acid, ASTM A, Practice C, (Huey Test). Nitric Acid, ASTM A

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The chart below comes from the ASTM A standard for selection of the appropriate test by alloy prwctice. We provide intergranular corrosion evaluation, salt spray testing, stress corrosion, xstm various other methods to simulate exposure of your products or materials to corrosive environments. If materials with incorrect heat treatment enter service, they are liable to crack pfactice fail by intergranular corrosion IGC much more rapidly than properly treated materials; ASTM A is a screening test to help find batches that are incorrectly processed.

Some specific hazards statements are given in Practice E, the Strauss test, is performed to assess attack associated with chromium-rich carbide formation; it does not detect susceptibility to sigma phase formation.

This method is a hour boiling test for “as received” specimens of stainless steel. This simple etching technique is used as a quick screening method to ensure that a material is free of intergranular corrosion susceptibility. If you are not sure, please contact us for assistance. Similar to the Streicher test, the Huey test method uses a nitric acid solution and subjects the specimen to five hour boiling intervals. View zstm articles about Aerospace Oil and Gas Transportation.

However, when a material is exposed to high temperatures for long periods of time, a process called sensitization may occur. This specification covers the standard practices for detecting susceptibility to intergranular attack in austenitic stainless steels.

Please refer to the specification for more details. Practice F, is a hour weight-loss based analysis that provides a quantitative measure of the materials performance, and is commonly used to analyze as-received awtm steels.


Due to the variance of attack in different materials, numerous methods Practices B-F are used to assess intergranular corrosion. Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: ASTM A testing is a popular method of choice due to the variety of practices available and the relatively short turnaround for results.

Classification of the structure after A Practice A analysis will determine if the material is acceptable or if additional testing is required. This method is preferable for chromium depletions and corrosion in intermetallic phases. Methods for preparing the test specimens, rapid screening tests, apparatus setup and testing procedures, and calculations and report contents are described for each testing practice.

Corrosion Testing

Our knowledgeable scientists have the experience and expertise necessary to determine the most appropriate intergranular attack testing methods for your material while providing actionable results you can rely on. It depends on which Practice is selected, but typically ranges from to days for different tests. The samples are weighed at each interval to determine mass loss and degree of susceptibility to intergranular attack.

Work Item s – proposed revisions of this standard. To understand intergranular corrosion testing or intergranular attack commonly abbreviated as IGC or IGAit is important to understand what causes the process to occur.

Link to Active This link will always route to the current Active version of the standard. Please share this page: What is your typical turnaround time? Choosing an Intergranular Corrosion Test Method Since high temperature processing such as heat treatment is a common practice, many manufacturers wish to perform intergranular corrosion qualification testing on each batch, to ensure that the material has been processed correctly and does not show signs of corrosion susceptibility.

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In everyday applications, corrosion varies by materials and solutions. For example, many low-carbon and stabilized stainless steels e.

Strauss test practic are boiled in a Copper Sulfate – Sulfuric Acid mixture for 15 hours. Sensitization causes the grain boundaries of a material to precipitate, creating carbide deposits and causing the material to be susceptible to intergranular attack.

ASTM A Testing: An Overview of Intergranular Corrosion | Element

Please specify the maximum allowable corrosion rate and any available data on the sensitizing heat treatment performed. This practice includes boiling the sample for 24 to hours in the solution above, and measures the materials performance quantitatively.


Since high temperature processing such as heat treatment is a common practice, many manufacturers wish to perform intergranular corrosion qualification testing on each batch, to ensure that the material has been processed correctly and does not show signs of corrosion susceptibility.

Based on your materials, application, and requirements, the other 4 methods provide specific focuses. G2MT Labs is one of the few labs to offer all five ASTM A corrosion testing practices, as well as the expertise to help you determine which tests to use, what to do if a test fails, and other corrosion consulting as needed. Contact us now for pricing or a quote! ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

The Copper Sulfate Test is especially effective for determining susceptibility to intergranular attack for low carbon steels. How do you select the right ASTM corrosion testing method for your material? The test uses a visual inspection of the surface of the bent specimen to determine pass or fail. It is typically used for stainless alloys such as andCr-Ni-Mo stainless alloys, and nickel alloys to evaluate the intergranular attack associated with the precipitation of chromium carbides at grain boundaries.

At the conclusion off the test, specimens are either visually examined or measured for weight loss and compared to an established corrosion rate for that specific material type.

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The test is generally performed for acceptance of materials, but not sufficient for rejection of materials. Choosing the correct method s rely on a complete understanding of your material and processes, as well as the concept of corrosion itself.

These practices include five intergranular corrosion tests, namely: